Fire resistant and preservative composition



'106. CONiPOSlTlONS,

COATING OR PLASTIC Patented Mar. 7, 1933 Cross Reference PATENT OFFICE JOSEPH RIGBY WATSON, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO VIRGINIA LOUISE WATSON, OF SAN FRANCISCO, CALIFORNIA FIRE RESISTANT AND PRESERVATIVE COMPOSITION No Drawing. Application filed Ju1y 18,

My invention relates to a fire resistant and preservative composition. and particularly one which serves as a coating composition.

An object of my invention is the provision of a composition of the character described which will effectively act as a preservative coating for materials to which it is applied.

Another object of my invention is the provision of a composition of the character described which serves as a fire resistant coating for combustible materials.

My invention possesses other objects and valuable features, some of which will be set forth in the following description of my invention. It is to be understood that I do not limit myself to the showing made by the said description. as I may adopt varying forms of my invention within the scope of the claims.

In terms of broad inclusion my invention comprises a mixture of an alkali metal silicate. an alum or other equiva en sa an a fi udrine Edmund of the character of crvolite or an alkali metal fluosilicate, in a vehicle such as a minera oi. ituminous material such as tars and as halts. or drvin oils such as linseed Oll. lhis mixture provides a coat ing composition which can be applied to the materials to be treated.

In terms of greater detail. a satisfactory composition has been prepared bythe mixture of the following substances in approximate parts by weight:

Parts Cryolite 4 Ammonia alum 2 Sodium silicate 2 final mixture; therefore, it is apparent that various volumes of vehicle can be employed. However, for a mixture which can be applied with a brush, from 2 to 3 gallons of vehicle are preferred when the parts of the other ingredients are in pounds.

For the cryolite in the above composition. satisfactory results have been obtained by substituting the same quantity of an alkali metal fluosilicate such as sodium or )otassium fluosilicate. Sodium fluosihcate is preferred due to its greater availability and lesser cost. Also a mixture of various quantities of cryolite and an alkali metal fluosilicate can be used in place of one of these compounds alone to give a total of four parts by weight of fluorine compound. Ammonia alum is preferred since the best resu s ave en obtained by its use, but various other alums can be substituted therefor. For instance the same quantity of ammonia chrom. ammonia iron, otassium, sodiu i, or otassium iron Ill fins can e employed; or if desired straight salts such as ferric or ferrous sulfate. or 1 l r 1 inu n; sp l fate can be su stitute or the two parts of alum. In place of the sodium silicate, the same quantity of another alkali metal silicate as potassium silicate can be used.

The proportions stated in the preceding example are those which have been found to produce the best results. However, the quantities of the ingredients or their substitutes, may be varied within a wide range with satisfactory results. For example, the following range of substances in parts by weight can be employed with the vehicles previously described:

1928. Serial No. 293,784.

Parts Fluorine com ound of the character of crvolite or of an alkali metal 'flHO-SIHCQIQE 1 to 10 An alum or the equivalent 1 to 4 Alkali metal silicate lto 5 The quantity of vehicle is determined by the Examiner porated in the desired vehicle by mixing and stirring.

The compositions when applied as a coating to combustible materials such as wood, paper, or fabrics such as canvas, serve to resist fire for a long time, and to prevent the spreading of flames. The materials thus treated will only char at the point of contact with the fire without bursting into flames. It is thought that this condition is created by the generation of gases which prevent the access of oxygen to the treated material. As previously set forth, it is preferred to apply the coating by means of a brush. However, if desired. the materials to be treated may be immersed in a bath of the coating composition.

Notonly have these compositions been found to effectively resist fire, but they also act as preservatives when applied to materials such as wood, railroad ties, or wood pilings.

I claim:

1. A fire resistant and preservative composition comprising a substance of the group consisting of cryolite and an alkali metal fluosilicate, an alkali metal silicate, and an oil vehicle.

2. A fire resistant and preservative composition comprising a substance of the group consisting of cryolite and an alkali metal fiuosilicate, an alum. an alkali metal silicate, and a bituminous vehicle.

3. A fire resistant and preservative composition comprising a vehicle, and the following substances in parts by weight:

Parts A substance of the group consisting of cryolite and an alkali metal fluosilicate 1 to 10 An alum 1 to 4 An alkali metal silicate 1 to 5 4. A fire resistant and preservative composition comprising a vehicle, and the following substances in approximate parts by weight:

Parts A substance of the group consisting of vcryolite and an alkali metal fiuosilicate 4 An alum 2 An alkali metal silicate 2 7. A fire resistant and preservative composition comprising cryolite, sodium silicate, and alum, and a bituminous vehicle.

8. A fire resistant and preservative composition comprising a bituminous vehicle, and the following substances in parts by weight:

Parts Cryolite 1 to 10 An alum 1 to 4 Sodium silicate 1 to 5 9. A fire resistant and preservative composition comprising a bituminous vehicle. and the following substances in approximate parts by weight:

Parts Cryolite 4 An alum 2 Sodium silicate 2 my hand.

JOSEPH RIGBY \VATSON. 

